http://www.voki.com/

Have the students create a character to teach about a concept. Then they can have it embedded on a website to share with others. For instance, each student in your class could have a person to teach about from the civil rights movement. They would each create a voki to go along with that character, put the information as if it were coming from first person. Then each of them could listen to the other's reports from the vokis.